The rainbow flag, sometimes pride flag or gay pride flag, is a symbol of lesbian, gay, bisexual, and transgender (LGBT) pride and LGBT social movements in use since the 1970s. The colours reflect the diversity of the LGBT community, and the flag is often used as a symbol of gay pride in LGBT rights marches. It originated in California, but is now used worldwide. Designed by San Francisco artist Gilbert Baker in 1978, the design has undergone several revisions to first remove then re-add colours due to widely available fabrics. As of 2008, the most common variant consists of six stripes, with the colours red, orange, yellow, green, blue, and violet. The flag is commonly flown horizontally, with the red stripe on top, as it would be in a natural rainbow.