Generating your own specMake consistent icons within your gameUnderstanding how some choices naturally change othersReally good resourcesGoogle & AppleLooks real, or is iconised3D or 2D in appearanceTransparency- are parts of image see through?Shading- flat shading through to ‘realistic’Square Edged, rounded square, circular etc.Axis of Symmetry / MirroringRules are meant to be broken?Break little things whilst keeping to the idea of the ruleSlipping too far from your specification will lead to inconsistencyConsistency is important with a collection.Google Material DesignApple Human Interface Guidelines