Time Passages is a collection created as a New Unique Adult Coloring Books Series. They are intended to provide an interesting relaxing and enjoyable pastime. They have been created to provide you with an opportunity to use your imagination and creativity and to have fun. More interesting than the traditional follow the lines coloring books, these unique coloring books for adults provide ample variety of stress relieving design originals, including simple line drawings, scenes and landscapes, grey scale drawings and wire frame drawings. There are opportunities to add your own detail, there are pages that can be completed fairly quickly and pages that can absorb much longer periods. This set of 21 Interesting subjects includes; Airplanes and Helos Balloons and Air ShipsBirdsBuildings Architecture and CityscapesButterfliesCars and BikesDogsFish, Fishing and Sea CreaturesFlowersMachinery and EquipmentMilitaryMotors and EnginesMusicShipsTanksTrainsTrucks Horses WarriorsStill Life Wild Animals