diff --git a/src/fields/spec.jsx b/src/fields/spec.jsx
index 5cec027d..81813c1f 100644
--- a/src/fields/spec.jsx
+++ b/src/fields/spec.jsx
@@ -1,94 +1,148 @@
 import React from 'react'
 import Immutable from 'immutable'
+import color from 'color'
+
 import GlSpec from 'mapbox-gl-style-spec/reference/latest.min.js'
 import NumberField from './number'
 import EnumField from './enum'
 import ColorField from './color'
 import StringField from './string'
+import inputStyle from './input.js'
+import theme from '../theme.js'
 
-class SpecField extends React.Component {
-	static propTypes = {
-    onChange: React.PropTypes.func.isRequired,
-    fieldName: React.PropTypes.string.isRequired,
-    fieldSpec: React.PropTypes.object.isRequired,
-		value: React.PropTypes.oneOfType([
+function isZoomField(value) {
+  return Immutable.Map.isMap(value)
+}
+
+const specFieldProps =  {
+  onChange: React.PropTypes.func.isRequired,
+  fieldName: React.PropTypes.string.isRequired,
+  fieldSpec: React.PropTypes.object.isRequired,
+}
+
+/** Supports displaying spec field for zoom function objects
+ * https://www.mapbox.com/mapbox-gl-style-spec/#types-function-zoom-property
+ */
+class ZoomSpecField extends React.Component {
+  static propTypes = {
+    ...specFieldProps,
+    value: React.PropTypes.oneOfType([
       React.PropTypes.object,
       React.PropTypes.string,
       React.PropTypes.number,
-    ]).isRequired,
+    ]),
   }
 
-	onValueChanged(property, value) {
-		return this.props.onChange(property, value)
-	}
+  render() {
+    if(isZoomField(this.props.value)) {
+      const zoomFields = this.props.value.get('stops').map(stop => {
+        console.log(stop)
+        const zoomLevel = stop.get(0)
+        const value = stop.get(1)
+        console.log(zoomLevel, value)
 
-	render() {
-		switch(this.props.fieldSpec.type) {
-			case 'number': return (
-				<NumberField
-					onChange={this.onValueChanged.bind(this, this.props.fieldName)}
-					value={this.props.value}
-					name={this.props.fieldName}
-					default={this.props.fieldSpec.default}
-					min={this.props.fieldSpec.min}
-					max={this.props.fieldSpec.max}
-					unit={this.props.fieldSpec.unit}
-					doc={this.props.fieldSpec.doc}
-				/>
-			)
-			case 'enum': return (
-				<EnumField
-					onChange={this.onValueChanged.bind(this, this.props.fieldName)}
-					value={this.props.value}
-					name={this.props.fieldName}
-					allowedValues={this.props.fieldSpec.values}
-					doc={this.props.fieldSpec.doc}
-				/>
-			)
-			case 'string': return (
-				<StringField
-					onChange={this.onValueChanged.bind(this, this.props.fieldName)}
-					value={this.props.value}
-					name={this.props.fieldName}
-					doc={this.props.fieldSpec.doc}
-				/>
-			)
-			case 'color': return (
-				<ColorField
-					onChange={this.onValueChanged.bind(this, this.props.fieldName)}
-					value={this.props.value}
-					name={this.props.fieldName}
-					doc={this.props.fieldSpec.doc}
-				/>
-			)
-			default: return null
-		}
-	}
+        return <div key={zoomLevel}>
+          <b><span style={inputStyle.label}>Zoom Level {zoomLevel}</span></b>
+          <SpecField {...this.props} value={value} />
+        </div>
+      }).toSeq()
+      return <div style={{
+          border: 1,
+          borderStyle: 'solid',
+          borderColor: color(theme.colors.gray).lighten(0.1).hexString(),
+          padding: theme.scale[1],
+        }}>
+        {zoomFields}
+      </div>
+    } else {
+      return <SpecField {...this.props} />
+    }
+  }
+}
+
+/** Display any field from the Mapbox GL style spec and
+ * choose the correct field component based on the @{fieldSpec}
+ * to display @{value}. */
+class SpecField extends React.Component {
+  static propTypes = {
+    ...specFieldProps,
+    value: React.PropTypes.oneOfType([
+      React.PropTypes.string,
+      React.PropTypes.number,
+    ]),
+  }
+
+  onValueChanged(property, value) {
+    return this.props.onChange(property, value)
+  }
+
+  render() {
+    switch(this.props.fieldSpec.type) {
+      case 'number': return (
+        <NumberField
+          onChange={this.onValueChanged.bind(this, this.props.fieldName)}
+          value={this.props.value}
+          name={this.props.fieldName}
+          default={this.props.fieldSpec.default}
+          min={this.props.fieldSpec.min}
+          max={this.props.fieldSpec.max}
+          unit={this.props.fieldSpec.unit}
+          doc={this.props.fieldSpec.doc}
+        />
+      )
+      case 'enum': return (
+        <EnumField
+          onChange={this.onValueChanged.bind(this, this.props.fieldName)}
+          value={this.props.value}
+          name={this.props.fieldName}
+          allowedValues={this.props.fieldSpec.values}
+          doc={this.props.fieldSpec.doc}
+        />
+      )
+      case 'string': return (
+        <StringField
+          onChange={this.onValueChanged.bind(this, this.props.fieldName)}
+          value={this.props.value}
+          name={this.props.fieldName}
+          doc={this.props.fieldSpec.doc}
+        />
+      )
+      case 'color': return (
+        <ColorField
+          onChange={this.onValueChanged.bind(this, this.props.fieldName)}
+          value={this.props.value}
+          name={this.props.fieldName}
+          doc={this.props.fieldSpec.doc}
+        />
+      )
+      default: return null
+    }
+  }
 }
 
 export class PropertyGroup extends React.Component {
-	static propTypes = {
+  static propTypes = {
     onChange: React.PropTypes.func.isRequired,
-		properties: React.PropTypes.instanceOf(Immutable.Map).isRequired,
-		layerType: React.PropTypes.oneOf(['fill', 'background', 'line', 'symbol']).isRequired,
-		groupType: React.PropTypes.oneOf(['paint', 'layout']).isRequired,
+    properties: React.PropTypes.instanceOf(Immutable.Map).isRequired,
+    layerType: React.PropTypes.oneOf(['fill', 'background', 'line', 'symbol']).isRequired,
+    groupType: React.PropTypes.oneOf(['paint', 'layout']).isRequired,
   }
 
-	render() {
-		const layerTypeSpec = GlSpec[this.props.groupType + "_" + this.props.layerType]
-		const specFields = Object.keys(layerTypeSpec).map(propName => {
-			const fieldSpec = layerTypeSpec[propName]
-			const propValue = this.props.properties.get(propName)
-			return <SpecField
-				onChange={this.props.onChange}
-				key={propName}
-				value={propValue}
-				fieldName={propName}
-				fieldSpec={fieldSpec}
-			/>
-		})
-		return <div>
-			{specFields}
-		</div>
-	}
+  render() {
+    const layerTypeSpec = GlSpec[this.props.groupType + "_" + this.props.layerType]
+    const specFields = Object.keys(layerTypeSpec).map(propName => {
+      const fieldSpec = layerTypeSpec[propName]
+      const propValue = this.props.properties.get(propName)
+      return <ZoomSpecField
+        onChange={this.props.onChange}
+        key={propName}
+        value={propValue}
+        fieldName={propName}
+        fieldSpec={fieldSpec}
+      />
+    })
+    return <div>
+      {specFields}
+    </div>
+  }
 }